Update cbindgen requirement from 0.21.0 to 0.24.3

[dependabot]

Updates the requirements on cbindgen to permit the latest version.

Release notes

Sourced from cbindgen's releases.

v0.24.3

• Make struct expressions correctly generated through typedefs (#768).

Changelog

Sourced from cbindgen's changelog.

0.24.3

  * Make struct expressions correctly generated through typedefs ([#768](https://github.com/eqrion/cbindgen/issues/768)).

0.24.2

  * Make bitfield operators use explicit constructors.

0.24.1

  * Add support for unary negation ([#765](https://github.com/eqrion/cbindgen/issues/765)).
  * Make more bitfield operators constexpr ([#765](https://github.com/eqrion/cbindgen/issues/765)).

0.24.0

  * Basic const generic support ([#759](https://github.com/eqrion/cbindgen/issues/759), [#760](https://github.com/eqrion/cbindgen/issues/760) [#762](https://github.com/eqrion/cbindgen/issues/762)).
  * Suffixes on integer literals are now honored to avoid narrowing ([#764](https://github.com/eqrion/cbindgen/issues/764)).

0.23.0

  * Better support for constexpr. ([#756](https://github.com/eqrion/cbindgen/issues/756))
  * constexpr is now enabled by default in C++ mode. You can use const.allow_constexpr=false to revert to previous behavior. ([#756](https://github.com/eqrion/cbindgen/issues/756))
  * Minimum syn version no longer parses old rust code. ([#754](https://github.com/eqrion/cbindgen/issues/754))

0.22.0

  * Support rename rule for union body members ([#751](https://github.com/eqrion/cbindgen/issues/751)).
  * constant: Add support for associated constant expressions ([#752](https://github.com/eqrion/cbindgen/issues/752)).
  * Fix regression in CamelCase rename rule (should be lowerCamelCase) ([#750](https://github.com/eqrion/cbindgen/issues/750)).
  * enumeration: simplify standard types in variants ([#749](https://github.com/eqrion/cbindgen/issues/749)).
  * Avoid generating and writing bindings when called recursively ([#747](https://github.com/eqrion/cbindgen/issues/747)).
  * Cython: Omit per-variant tags in unions generated for Rust enums ([#748](https://github.com/eqrion/cbindgen/issues/748)).
  * Update various dependencies.

0.21.0

  * Update MSRV to 1.54.0
  * Update clap to 3.1.
  * Update heck to 0.4.0
  * unraw identifiers
  * Honor documentation_length in Cython.
  * Add documentation_style to with short and full options
  * Map RawFd to Int
  * Respect remove_underscores config when prefixing name to enum

0.20.0

 * Add Builder::with_using_namespaces. ([#688](https://github.com/eqrion/cbindgen/issues/688))
 * Ignore PhantomPinned. ([#695](https://github.com/eqrion/cbindgen/issues/695))
 * Simplify Pin<T> to T. ([#697](https://github.com/eqrion/cbindgen/issues/697))

... (truncated)

Commits

• f43ccfc Bump version.
• 116a18c tests: Add a test for struct constants going through typedefs.
• fc98189 bindings: Peel through typedefs for struct constant generation.
• 4b30c56 Rustfmt recent changes.
• 3d06ae1 Version bump.
• 80da604 bitflags: Be explicit in binary operators and such.
• 9855f90 Version bump.
• 5da3715 constant: Add support for unary negation.
• 021d09d bitflags: Make more operations constexpr.
• 2e2c87e Fix changelog typo.
• Additional commits viewable in compare view

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